Gas retarding and adjusting device



April 14, .1925. 1,533,896

F. W. POPE GAS RETARDING AND ADJUSTING DEVICE- Filed May 28. 1924 b if IN VEN TOR.

ATTORNEY.

Patented Apr. 14, 1925.

unrrsn' STATES-PATENT Fries.

' FREDERICK W. POPE, OF ROXBURY, MASSACHUSETTS.

GAS RETARIDING ANI) ADJUSTING DEVICE.

Application filed May 28, 1924. Serial No. 716,361.

To all whom 2'25 may concern;

Be it known that I, FREDERICK WV. Porn,

a citizen of the United States, residing at Roxbury, county of Suffolk, and State of Massachusetts, have invented certain new and useful Improvements in Gas Retarding and Adjusting Devices,

lowing is a specification. V

to a device for re This invention relates of which the fol tarding and adjusting the flow of hot through boiler tubes.

Heretofore in an endeavor to retard the flow of gases resort has been had to placing a spirally curved lath inside the tube which spiral extended the whole length of the tube, or else a bushing of some sort was inserted in thetube, but

these devices collected soot and dirt and were difficult to insert and remove from the tube for the purpose of Furthermore, nonejof these devices could adjust theflow of gas the primary object of th cleaning the tube.

in, the tube. It is e present invention to provide a device by means of which the flow of gas may be retarded and adjusted through a particular tube or through a particular nest of tubes in a boiler, making the circulation of gases uniform throughout the boiler. Another object of this invent-ionis to provide a retarder that may be readily mounted in and removed from the tube withoutinterfering with the adjacent retarder or tube.

A further object is to provide a retarder and adjuster that permits the blowingor cleaning of the boller tubes without its removal. A is to provlde a retarder still further object and adjuster that is adapted to expand and contract. A further object is to provide juster that is simple and facture.

a retardcr and adeconom c to manu- The invention will be more fully ex plained hereinafter with reference to the acconipanying drawings 1 rated and in whichin which it is illus Figure l a front view'of the improved device shown in position, parts of the device in the lower tube being broken away in the interest of clearness.

Figure 2 is a cross section of Figure 1 taken onthe plane indicated by the line 2-2 and lookingin the rows, the retarder in the lower tube being shown in elevation.

direction of the ar- Figure 3 is a modification of the improved device.

Figure 4 1s a cross s ection of Figure 3 taken on the plane indicated by thev line 4 l and looking; in the direction of the arrows. I

Figures 5 and 6 are detail views showing the choker plates with bores of differentsize.

Similar characters ofreference designate corresponding parts throughout the various views. v

As is well known the boilerplate a of the" into each of which is fitted a tube '22 made of wrought iron, steel or any suitable material. The tube 1) is secured by means of the head 0. These tubes Z) serve to convey boiler is provided with a number of holes the flame, smoke and. hot gases from the fire box to the smoke stack, and at the same time their sides provide ample heating surface to allow the heat contained in the products of combustion to escape into the water. In operating a boiler, it is desirable that the flow of gases be as uniform as possible throughout the tubes in the boiler. This is accomplished in the present invention by retarding and adjusting the flow of the gases through any particular tube or tubes by inserting the improved device in the desired tube or tubes. This retarding and adjusting device comprises a tubular portion at and a flanged or outboard por-' tion a and may be made of any suitablecmaterial. The tubular portion d is slightly tapered as indicated at f so as to provide a snug fit within the tube 6. .A slot 9 extends the entire length of the tubular portion d through its upper section. This slot '9 perplane at an angle to the verti al; that is to say, it is beveled. Theupper section of'the flanged portion 6 has an annular slot m for one half its circumference. This slot on is cut atsthe same angle as the face is. The lower section of the flanged portion 6. has an annular groove n on its interior surface extending for one half of the circumference of the flangedportion e and in alignment with the slot on in the upper section of the flanged portion 6. The width of the slot on and the groove n is the same. Into the slot on is placed a choker plate 0. This choker plate 0 comprises enlarged portion 3'), a smaller portion q, a bore 7" and shoulders 3. Figures 5 and 6 show choker plates with bores of different diameters. \Vhen the choker plate is slid into the slot m the top of theplate is flush with the top of the flangedportion 6' and the bottom or smaller portion 1' of the plate rests in the groove 1;.

The shoulders a rest on the seats if provided by the slot 7n and in this way the plate is prevented from rocking or moving out oi place.- By reason oii the construction of the plate 0, when it is in position in the flanged portion 6, the bore r of the plate excjentric to the bores or openings in the tubular portion d and the tube Z). Andby reason of the beveled cut or slot on, when the clroker plate 0 is removed from the flanged portion 6, it is not lifted out of the flanged portion 6 in vertical plane but in a plane at an angle to the vertical aswill be seen from" Figure 2, thus avoiding con tactwith the adjacent tube about it.

In the modification shown in Figures 3 and 4:,the annular groove in the lower secand the flanged portion 6 of theimproved device is of a smaller sectional area than the sectional area of the boiler tube and by reason of this construction the flow of gas through the boiler tube is retarded to a certain degree. To retard the flow still further and to adjust the flow, a choker plate 0, with a bore of any desired siie, is inserted in the flanged portion e. As will be noted, the retarding and adjusting device may be inserted in any particular tube or tubes in the boiler. hen the choker plate 0 is in position the gasimpinges against it and its How is retarded thereby retain- 7 ing the gas in the tube for heat producing The beveled portion it reduces theinterference that would otherwise occur at this point.

It is not desired to limit the invention to the particular modifications described and illustrated herein, but the appended claims are intended to cover all variations of the invention wh'ch may be made from the principle herein disclosed.

I claim:

1. A device for retarding and adjusting tube, and removable means carried by the flanged portion to retard andadjust the flow of gas.

3. A device for retarding and adjusting the How ofgas in boilertubes comprising. a tubular bod portion, and a flanged" po-r tion, sa'id'portions having anopening smaller in diameter than the opening'in' the boiler tube, and a plate slidably mounted in the flanged portion to retard and adjust the flow of gas.

4. A device for retarding and adjusting the flow of gas in boiler tubes comprising a tubular body portion, a tubular flanged portion, said flanged portion having a circumferential slot, and a plate slidably mounted in said circumferential slotand having an opening smaller in diameter than the opening in the flanged portion.

5. device for retarding and adjusting the flow of gas in boiler tubes comprising a tubular body portion, a flanged portion, a removable p'late carried by the; flanged portion, and means to permit the insertion and removal of said plate in said flanged portion without interfering with the adj acent tubular or flanged portion.

6'; A device forretarding and adjusting the How of gas in boil-er tubes comprising a tubular body portion tapered and slit longi tudinally, a flanged portion having its face beveled, said flanged portionhaving a db cnmferential slot, out at the same angle as the 'lace' of th'c flanged portion, and an apertured plate for insertion in said slot.

7. A device for retarding and adjusting the flow of gas in boiler tubes, comprising a tubular body portion tapered longitudinally, said body portion having a longitndinal slot to enable it to contract and expand, and having a beveled inner edge to man tate longitudinal movement of a cleaning device, a flangedportion having a beveled face, said flanged portion beingslotted for one half its circumference at the same angle as the beveled face, said flanged portion being grooved on its interior surface fonthe other half 0i its circumference, said slot and groove being in alignment, said body and flanged portions having an opening smaller in diameter than the opening in the boiler tube, and a plate mounted slidably in said flanged portion, said plate comprising an enlarged portion terminating in a shoulder at each side and a smaller portion, said shoulders adapted to rest on seats formed by the lower section of the flanged portion, and said plate having an opening of any desired size.

8. A device for retarding and adjusting the flow of gas in boiler tubes comprising a tubular body portion tapered and slit longi tudinall a flawed oortion said flan ed Y c; 7 portion having a e1reu1nferent1al slot and being grooved on its interior surface, said FREDERICK W. Porn. 

